System for the transmission of electromagnetic waves with sound-regulated frequencies.



v y W. H. BATHRICK SYSTEM FOR THE TRANSMISSION OI ELECTROMAGNETIC WAVES WITH SOUND REGULATED FREQUENGI ES.

APPLICATION EILED APR.3,1908.

Patented Feb. 1, 1910.

2 SHEETS-SHEET 1,

INVENTEJRQ WIT NIE EEE a W. H. BATHRICK.

SYSTEM FOR THE TRANSMISSION OF ELECTROMAGNETIC WAVES WITH SOUND REGULATED FREQUENCIES.

APPLICATION FILED APR.3,1908. 948, 1 56. Patented Feb. 1, 1910. 2 SHEBTS-SHEET 2.

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OFFICE.

"WALTER H. BATHRICK, OF SOMERVILLE, MASSACHUSETTS.

SYSTEM FOR TRANSMISSION F ELECTROMAGNETIC WAVES WITH SOUND- REGULATED FREQUENCIES.

Specification of Letters Patent.

Patented Feb. 1, 1910.

Application filed April 3,;1908. Serial No. 424,921.

To all whom it may concern:

Be it known that I, WALTER H. BATH- RICK, a citizen of the United States, residing at Somerville, in the county of Middlesex and State of Massachusetts, have invented anew and useful System for the Transmission of Electromagnetic Waves with I Sound-Regulated Frequencies.

In the drawings illustrating my invention and the best methods known to me of applying my system, Figure 1 is a diagrammatic view of the'method of" vocallycontrolling the electro-magnetic waves from an induction coil generator, with a high frequency interrupter. Fig. 2 presents a modification, showing diagrammatically the manner of applying my system to a dynamo generatorof a continuous series of highfrequency ele'ctro-magnetic waves. Fig. 3 is another slight modification of the same, showing two or more dynamo generators of electro-magnetic waves arranged in series.

Primaryv windings 'are represented by heavy lines; secondary windings and connections by light lines.v The light lines merging into the heavy lines indicate the connection in series between the secondary and primary Windings'in each separate circuit. Right and left sloping lines (either light or heavy) denote windings with normal differences in field polarity.

In Fig. 1 the electro-magnetic waves are produced primarily from a large induction coil or inductorium consisting of one or more cores of soft iron wire 0', C, and C, and a'primary 0011 P 1n the circult of a source of electrical energy B with a current of frequent interruptions from an interrupter I, and a secondary S, with its spark gap 8 g, and aerial and ground connections. Two other primary coils P and P are placed in position to influence the same field. All three, primaries, P, P, and

P, may be wound upon the same soft iron wire core, but to lessen the inductive effect of one primary coil upon another, the secondary coils S are wound between each of the primary coils P, P, and P with gaps in the magnetic continuity of the core "at M and M of air or non-conducting material. The secondary coils S are influenced by the mutual induction and resultant fields of all the rima-ries P, P, and 1, thereby control ing and governing said secdndary in the circuit at electrical. oscillations. The

primary coil P is connected to the fsecondary coil S in thevconducting clrcult of an independent generative .source of con-' ntial, (preferably of low resiststant p0 while the'primary coil P is conance) nected in like manner to the secondary coil S in the conducting circuit of another independent source of constant'potential B. It is advisable to have the said two circuits balance, with equal constant difierences of potential in each circuit (when not in oper ation) and practically the same resistance in each circuit, and the same number of windings in each primary coil P and P, and.

also corresponding windings in each secondary coil S and S. The primaries and the secondaries arevso connected'each in its own circuit, that the said primaries P" and P have opposing fields (pr'eferabl canceling or neutralizing the effect of eac other), while the secondaries S and S' also have opposing fields (preferably neutralizing).' The proportional relation be tween the ampere turns in the primary windings P and P and the ampere turns in the secondary windings S" and S is dependent upon the ratio of the cross section of the field C" and C'" to the cross section of the smaller field core C, and upon. 7

the amount of constant E. M. F. and the resistance in each independent circuit. The

said secondaries S and S (are wound upon.

Waves of sound or speech implnge upon a diaphragm, varying the resistance 1n a transmitten T, and synchronously varying the current strength 1n a primary P, producing concomitant fluctuations in the magnetic field of the core C and inducing'an elect-romotive force in both secondary coils'S and S. As herein described, the secondaries (each in an inde endent circuit with its source of electrica energy of constant potential) are so connected to op ose in their fields, consequently the induced F. will 25. tial, and into its circuit of electrical oscilla- Variable opposing potentials produce ,vari-" able decreases in current strength in one primary, while the coincidence of variable induced potential with constant potential, pro

and A arranged in series in said circuit, and r gas duces variable increases in current strength in the other primary. Opposition and coincidence of induced potentials s nchronously in each circuit, S" B P and B P are variable, alternating, and in accordance with the fluctuations of current in the soundcontrolled transmitter primary P. The fluctuations of current strength in both primaries P and P cause fluctuations in the fields C" and O', which in turn modify and intensify the field G of the interrupted primary P. The resultant fields generate electrical oscillations in the secondary S, corresponding to the waves of sound or speech.

In Fig. 2, a modification employing the same system of vocal control, the generator of electro-magnetic waves is a high-frequency dynamo G, preferably of high potentions are interposed two conducting coils A connected to oppose and neutralize their own magnetic fields in the core 0. The two primaries P and P are disposed on the outer ends of the coils A and A and upon the cores C and C. The iron wire magnetiz ng field may have one or more breaks or air spaces, preferably between the centers of the coils A and A. M and M represent these gaps. in the Ina 'netic continuity rendering' the primaries d and P less susceptible to their own respective fields. The secondaries S and S are arranged with opposing. fields as in Fig. 1, but the primar es P" and P are arranged with coinciding fields, otherwise the modifying influence on one would cancel that ofthe other in the two coils A and A, regulating the electrical oscillations, radiating as electro-magnetic,

waves. a

In Fig. 3, a modification, utilizing the same system, is a series of dynamo generators, or a single generator, with a series of modifiers or controllers, (with gaps in. their fields at M), interposed between each generator in the circuit as illustrated inthe diagram. The several pairs of primaries and the several pairs of secondaries may be arranged in separate independent circuits for each modifier or controller, or in two independent circuits with only two generators of constant potential B" and B as shown in the drawin What I c aim, and ters Patent, is 1 '1. In a system for the transmission of soundcontrolled electro radiant energy, a pair of secondaries of a sound-controlled desire to secure by Leta p A I primary, a pair of primaries connected with the sand secondaries a rnnar enerator of high frequencycurrents, asecondary connected with the conductors of electrical oscillations, all substantially as set forth.

2. In a system for the transmission of sound controlled electro radiant energy, pairs of secondaries of sound-controlled primaries, pairs of primaries connected with the said secondaries, a primary generator of high frequency currents, secondaries connected with the conductors of elec't-rical oscillations, all substantially as set forth.

3. In a system for the transmission of sound-controlled electro-radiant energy, the combination of means for the continuous generation of successive electro-magnetic waves of high frequencies, and a means of modifying the radiations in accordance with sound waves, consisting of two vocally controlled secondaries, eachin an independent combination of means for the continuous generation of successive electro-magnetic waves of hlgh frequencies, and a means of modifying the radiations in accordance Wltll.

sound waves, consisting of two primariesmodifying the fields of the high frequency alternating current coils, each primary in the circuit of a vocally controlled secondary; and each of said circuits so connected by an independent source of constant potential to maintain coinciding fields in the two modifying primaries and opposing fields in the two transmitter secondaries, all substantially as set forth.

5. In a system for the transmission of sound-controlled electro-radiant energy, the combination of means for the continuous generation of successive electro-inagnetic' waves of high frequencies, and a means of modifying the radiations in accordance with sound waves, consistin of pairs of primaries modifying the fiel s of the high frequency alternating current coils,-each primary in thecircuit of a vocally controlled secondary, and each circuit so connected by an independent source of constant potential to maintain coinciding field s'in the airs of modifying primaries and opposing 'elds in the pairs of transmitter secondaries, all substantially as set forth.

6. In a system for transmission of soundcontrolled electro-radiant energy, the combination of means for the continuous generation of successive electro-magnetic wavesof high frequencies, and a meansofmodifying the radiations in accordance with sound' rlmarles maintain opposing fields in the pairs of transmitter secondaries, all substantially as set forth.

' 7 In a system for the transmission of sound-controlled electro radiant energy, the combination of means for the continuous generation of successive electro'magnetic 1 waves of high frequencies, and a means of modifying. the radiations in accordance with sound waves, consisting of a primary coil in an electrically energized telephone transmitter circuit inducing variable currents, in a pair of secondary coils, each of said secondariesconnected by an independent source of electrical energy of constant potential to one of a pair of primaries mo ifying the secondary connected with the conductors of electrical oscillations, all-substantially as set forth.

WALTER H.v BATHRICK.

Witnesses:

HERBERT A. COLLIER, FREDERICK C. FULLER. 

